About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Tackling Structural Materials Challenges for Advanced Nuclear Reactors
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Presentation Title |
Neutron Irradiation Effects in PM-HIP Nuclear Structural Alloys |
Author(s) |
Janelle P. Wharry, Caleb D Clement, Yangyang Zhao, Sri Sowmya Panuganti, Yu Lu, Yaqiao Wu, Donna P Guillen, David W Gandy |
On-Site Speaker (Planned) |
Janelle P. Wharry |
Abstract Scope |
The objective of this talk is to summarize current understanding of irradiation effects on the microstructure and mechanical properties of nuclear structural alloys fabricated by powder metallurgy with hot isostatic pressing (PM-HIP). The nuclear industry has growing interest in replacing castings and forgings with PM-HIP components due to their near-net shape production, microstructural uniformity, and reduced reliance on machining and welding. Here, we directly compare PM-HIP alloys to cast/forged counterparts through an Advanced Test Reactor (ATR) neutron irradiation campaign to 1 and 3 displacements per atom (dpa) at 300-400°C. We focus on Ni-base Alloy 625, Grade 91 steel, and SA508 pressure vessel steel. Uniaxial tensile testing reveals consistent irradiation hardening and embrittlement between PM-HIP and cast/forged alloys. Dislocation loop, nanocluster, and void evolution are also relatively consistent between PM-HIP and cast/forged materials but are dependent upon initial microstructure. Results show promise for code qualification of PM-HIP structural materials. |